Supporting device for rotary multiple-support kilns



A ril 1, 1969 G. v. RAEVSKY SUPPORTING DEVICE FOR ROTARY MUTIPLE-SUPPORTKILNS Filed Feb. 28, 1967 United States Patent 3,436,062 SUPPORTINGDEVICE FOR ROTARY MULTIPLE- SUPPORT KILNS Georgy Vladimirovich Raevsky,per Mechnikova 3, kv. 6, Kiev, U.S.S.R. Filed Feb. 28, 1967, Ser. No.619,295 Int. Cl. F27b 7/22; F16c 41/02 U.S. Cl. 263-33 4 Claims ABSTRACTOF THE DISCLOSURE The present invention relates to supporting devicesfor rotating multiple-support kilns.

It is known in the prior art to provide multiple-support rotating kilnswhich rest on a plurality of rigid roller supports. In such kilns,because of the sagging of the supports and warpage of the kiln due tolocal overheatings, there occurs an eccentric vibration of thesupporting rings or rollers relative to the roller supports. As aresult, there is an overloading of a number of supports at the expenseof an underloading of other supports. In addition, there is anon-uniform distribution of the load between the rollers within onesupport. When such kilns operate, there is a non-uniform wear of thesupporting rollers and rings, a failure of the supporting rollers, afalling out of the refractory lining, and a failure of the kiln body.This is especially marked in furnaces of large diameters, possessing aconsiderable rigidity of their body.

In due course, there was proposed a supporting device complete withpiston hydraulic dampers which was provided between the supportingrollers and permitted the rollers to be drawn apart and brought togetherin relation to the load acting upon the supports. Such a design of thesupporting device eliminated many disadvantages pertaining to furnaceson rigid supports but was not free from objectionable characteristics.Firstly, to provide for a required value of support reactions, it isnecessary to set up high pressures. Secondly, to maintain the pressurein the hydraulic system, there is required a fairly complicatedautomatic device.

Moreover, piston hydraulic jacks require a thorough packing and carefulobservance of their operation. A particular disadvantage is theimpossibility of controlling the value of the support reaction onseparate supports when the loading duty is varying during the operationof the kiln without the shutting down thereof.

An object of the present invention is to eliminate the above-mentioneddisadvantages with the preservation of favorable qualities of theconstruction as above described.

The principal object of the present invention is to provide such adesign of the supporting device of a rotating multiple-support kiln,which compensates for the eccentric pulsation of the supporting rings ofthe kiln without considerable overloads of the roller supports and theoverstraining of the kiln body.

Another object of the invention is to distribute uniformly the loadbetween the supports and between the 3,436,062. Patented Apr. 1, 1969rollers within one support, as well as permitting at low pressures andwithout the use of complicated means, the

control of and maintenance of the supporting reactions of the specifiedvalue on all the supports taken together grl on each support separatelywithout shutting down one The foregoing objects are achieved due to thefact that the damping supports of the device comprise pneumatic cushionsinterconnected into one common pneumatic system or into a number ofgroup systems with the latter being convenient in a situation in whicharises a necessity for varying the value of the support reaction in aplurality of neighboring supports or in a separate support.

To maintain a constant value of supporting reactions, a receiver isconnected into a system of pneumatic cushions or to each separate group.

The nature of the present invention will become more fully apparent froma consideration of the following descrrption of an exemplary embodimentthereof, taken in conjunction with the accompanying drawings, in which:

Flt}. 1 is a diagrammatic view of a multiple-support rotatmg kiln on asupporting device according to the present invention;

and

FIG. 3 is a view partly in elevation and partly in section of apneumatic cushion.

The body of multiple-support rotating kiln 7 (FIG. 1) rests by means ofaxially spaced rings 2 on supporting rollers 3 mounted on a movableframe 4 (FIG. 2). The movable frame 4 rests on pneumatic cushions 5, andtransmits through such cushions a load on the foundation. The pneumaticcushions 5 are interconnected by means of pipe-lines 6, and to areceiver 7 so as to form a common pneumatic system.

From a compressor (not shown), air under pressure is supplied into thepneumatic system, and the value of the pressure is determined by apressure gauge 8 provided for the receiver 7.

Each pneumatic cushion 5 consists of a metallic bottom 9 (FIG. 3) anddiaphragm 10 of a rubberized cloth.

Due to the presence of a pressure in the pneumatic system, the movableframe 4 together with the supporting rollers 3 is always pressed to therings 2. In the operation of the kiln, when the supports sag, theadjustment of supporting rollers is broken, or the shape of the kiln isdistorted because of local overheatings, and an eccentric pulsation ofthe rings occurs. The pneumatic cushions 5 allow the movable frame andthe rollers mounted thereon to repeat all the displacements of the ringsduring their pulsation, and contribute to an improvement of the contactbetween the rolling surfaces of the rings and supporting rollers.

When the position of the diaphragm 10 varies after the movable frame,the volume of the pneumatic cushion is also likely to vary. Yet, sincethe volume of the receiver 7 is much greater than the volume of all thepneumatic cushions 5, the variation of the volume of the entirepneumatic system is fairly insignificant. At a constant temperature anda small variation of the volume of air in the pneumatic system, thepressure accordingly also varies to a small extent. Due to a variationin the receiver volume, one can achieve such a position when thepressure in the pneumatic system will remain practically constant withthe volume of the pneumatic cushions varying.

Therefore, with the surface areas of the diaphragms 10 of the pneumaticcushions 5 remaining constant and the pressure in the pneumatic systembeing practically constant, there is maintained substantially a constantvalue of the supporting reaction on each support,

Since the diaphragm of the pneumatic cushion possesses a fairly greatsurface area and each support is provided FIG. 2 is a view taken alongthe line IIII of FIG. 1;

with a plurality of pneumatic cushions, high pressures are not necessaryto effect the required value of the supporting reactions.

It is expedient to unite the pneumatic cushions of each support into anindependent system complete with the receiver. In this case, it ispossible, when varying the pressure in the system, to control the valueof the supporting reaction in each support separately without anyshutdown of the kiln.

The present supporting device is capable of ensuring, without the use ofany complicated appliances, the maintenance of a practically constantvalue of the supporting reaction, and enables the use of low pressuresin the system. It is simple to service, reliable in operation, andallows the control of the value of the supporting reactions without ashutdown of the kiln, thereby resulting in an increase in the servicelife of the refractory lining and in the coetficient of efficiency ofthe rotating kiln.

What is claimed is:

1. In a kiln assemblage, a rotatable body provided with a plurality ofaxially spaced rings, a set of rollers on which each ring rides forsupporting said rotatable body, a movable frame on which each roller setis mounted, a damping pneumatic cushioning means on which each movableframe rests, and a pneumatic system connecting said pneumatic cushioningmeans whereby said sets of rollers are capable of upward and downwardmovements as well as inclining movement in a vertical plane parallel tothe longitudinal axis of the rotation of the body thereby providinguniform contact between the sets of rollers and the rings.

2. The kiln assemblage according to claim 1, wherein said pneumaticcushioning means are interconnected in such a manner as to form a numberof separate group pneumatic systems.

3. The kiln assemblage according to claim 1, wherein a. receiver isincluded in said pneumatic system.

4. The kiln assemblage according to claim 2, wherein a receiver isincluded into each group pneumatic system.

References Cited UNITED STATES PATENTS JOHN J. CAMBY, Primary Examiner.

US. Cl. X.R. 3 089

